Overwintering guide
How to overwinter cryptanthus 'black mystic'
Winter watering
Cut watering right back — cryptanthus 'black mystic' uses far less while growth slows, and cold, wet compost is the usual cause of winter root rot. Stop feeding until spring.
The mistake that kills cryptanthus 'black mystic' in winter
Watering on the same schedule as summer. In winter that keeps the roots sodden while the plant is barely drinking, and cryptanthus 'black mystic' rots from the base.
More cryptanthus 'black mystic' care
Overwintering cryptanthus 'black mystic' — FAQ
Does cryptanthus 'black mystic' need to come indoors for winter?
Cryptanthus 'Black Mystic' is hardy to roughly USDA zone 10 — winter lows around -1°C. That means it will not survive frost and needs to come inside. Cryptanthus 'Black Mystic' is frost-tender, so overwintering means bringing it inside and letting it rest rather than pushing it to grow. Move it indoors well before the first frost, give it the brightest spot you have (light levels indoors drop sharply in winter), and keep it away from both cold window glass and hot radiators — the swing between the two does more damage than the cold itself.
When should I move cryptanthus 'black mystic' for winter?
Bring indoors when nights start dropping below about 10°C, ahead of the first frost.
How often should I water cryptanthus 'black mystic' in winter?
Cut watering right back — cryptanthus 'black mystic' uses far less while growth slows, and cold, wet compost is the usual cause of winter root rot. Stop feeding until spring.
What kills cryptanthus 'black mystic' over winter?
Watering on the same schedule as summer. In winter that keeps the roots sodden while the plant is barely drinking, and cryptanthus 'black mystic' rots from the base.